Linked from
The 18 pages that link to Mica, each with the reason it gives.
GraniteRelated: Biotite and muscovite provide common dark or silvery grains in granite.
GneissRelated: Mica often concentrates in darker bands and helps reveal mineral alignment.
SchistRelated: Mica commonly forms the aligned, reflective flakes visible in schist.
LipstickRelated: Mica can add shimmer or a pearlescent finish to lipstick.
Eye shadowRelated: Mica-based ingredients can give eye shadow shimmer.